Copy Code code as follows:
<?php
/*************by garcon1986*********/
The difference between print and Echo:
1. Echo can enter multiple strings, and print cannot.
print "Hello". " World "; Success
The echo "Hello". World "; Success
Print "Hello", "World"; Failed
echo "Hello", "World"; Success
2. echo is faster than print.
$stime = Microtime (true);
print "Hello". " World ";
$etime = Microtime (true);
$total = $etime-$stime;
echo $total. ' <br/> ';
Microtime-return current Unix timestamp with microseconds
$stime 2 = Microtime (true);
The echo "Hello". World ";
$etime 2 = Microtime (true);
$total 2 = $etime 2-$stime 2;
echo $total 2. ' <br/> ';
Execution results:
helloworld0.0014331340789795
helloworld0.00018310546875
See echo faster than print.
Print_r-prints human-readable information about a variable or array
$a = "SAJFD Sfjal sfjalwureoi WEU sj we FK IO";
Print_r ($a);
echo ' <br/> ';
$a = Array ("B", "C", "D");
Print_r ($a);
echo ' <br/> ';
Var_dump-dumps information about a variable or array
Var_dump--Information on printing variables
$a = "SAJFD Sfjal sfjalwureoi WEU sj we FK IO";
Var_dump ($a);
echo ' <br/> ';
$a = Array ("B", "C", "D");
Var_dump ($a);
echo ' <br/> ';
Var_dump (Array ("B", "C", "D"));
echo ' <br/> ';
?>
<?php
/************by garcon1986********/
%%-return percent symbol
%b-Binary number
%c-Characters with ASCII values
%d-Signed decimal digits
%e-Continuous counting method (e.g. 1.5e+3)
%f-floating-point number (Local settings Aware)
%F-floating-point number (not local settings aware)
%o-Eight binary number
%s-String
%u-Unsigned decimal digits
%x-16 Number (small letter)
%x-16 Number (capital letter)
printf () function output formatted string
$str = "Hello";
$number = 456;
Example1
printf ("%s World.") Day number%s ", $str, $number); Output: Hello world. Day Number 456
print "<br/>";
Example2
printf ("percent%", $number); //%
print "<br/>";
printf ("%b", $number); 111001000
print "<br/>";
printf ("%c", $number); ASCII code
print "<br/>";
printf ("%d", $number); 456
print "<br/>";
printf ("%e", $number); 4.560000e+2
print "<br/>";
printf ("%f", $number); 456.000000
print "<br/>";
printf ("%F", $number); 456.000000
print "<br/>";
printf ("%o", $number); 710
print "<br/>";
printf ("%s", $number); 456
print "<br/>";
printf ("%u", $number); 456
print "<br/>";
printf ("%x", $number); 1c8
print "<br/>";
printf ("%x", $number); 1c8
print "<br/>";
printf ("With 2 decimals:%1\$.2f<br/>with no decimals:%1\ $u <br/>", $number);
With 2 decimals:456.00
With no decimals:456
printf ("With 2 decimals:%f<br/>with no decimals:%1\ $u <br/>", $number);
With 2 decimals:456.000000
With no decimals:456
The fprintf () function writes the formatted string to the specified output stream (for example, a file or database).
$file = fopen ("Text.txt", "w");
Echo fprintf ($file, "fprintf 1:%s world. Day number%u ", $STR, $number). ' <br/> '; 38
Echo fprintf ($file, "fprintf 2:%f", $number). ' <br/> '; 21st
Echo fprintf ($file, "fprintf 3:with 2 decimals:%1\$.2f\nwith no decimals:%1\ $u", $number). ' <br/> '; 56
The vprintf () function outputs a formatted string.
The arg parameter in vprintf () is in the array. The percentage of the elements of the array that will be inserted into the main string (%) Symbol Place. The function is executed incrementally. In the first% symbol, insert arg1, at the second% symbol, insert arg2, and so on.
vprintf ("vprintf:%s World.") Day number%u ", Array ($STR, $number)); Vprintf:hello World. Day Number 456
echo ' <br/> ';
The sprintf () function writes the formatted string to a variable.
$txt = sprintf ("sprintf:%s World.") Day number%u ", $STR, $number);
echo $txt. ' <br/> '; Sprintf:hello World. Day Number 456
VFPRINTF () operates as fprintf () but accepts an array of arguments, rather than a variable number of arguments.
Echo vfprintf ($file, "vfprintf:%s world! Day number%u ", Array ($STR, $number)). ' <br/> '; 37
VSPRINTF () operates as sprintf () but accepts an array of arguments, rather than a variable number of arguments.
$txt = vsprintf ("vsprintf:%s World.") Day number%u ", Array ($STR, $number));
echo $txt. ' <br/> '; Vsprintf:hello World. Day Number 456
?>
